CN101466936B

CN101466936B - Cooling water channel structure of cylinder head

Info

Publication number: CN101466936B
Application number: CN2007800213398A
Authority: CN
Inventors: 永渊博树
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2006-08-28
Filing date: 2007-08-27
Publication date: 2010-10-27
Anticipated expiration: 2027-08-27
Also published as: WO2008026746A2; CN101466936A; JP2008051076A; US7980206B2; KR20090018651A; EP2057368A2; WO2008026746A3; KR101035443B1; US20090084332A1; JP4337851B2

Abstract

In an internal combustion engine, one end of a cylinder head (1) in the longitudinal direction is provided with a cooling water flow inlet (19) that opens into the interior of the cylinder head (1), while the other end of the cylinder head (1) in the longitudinal direction is provided with an outlet port (20) for a main cooling water flow (X) that flows through the central portion in the cylinder head (1). Furthermore, an outlet (21) for the sub cooling water flow (Y) which branches off from the main cooling water flow (X) and flows around the junction of the exhaust ports (5) is provided. An adapter (23) communicating with the main cooling water outlet (20) and the sub cooling water outlet (21) and combining these outflow ports (20, 21) into one cooling water outlet (22) is fixed to the outer wall surface of the cylinder head (1).

Description

The cooling water passage structure of cylinder head

Technical field

The present invention relates to a kind of cooling water passage structure of cylinder head.

Background technique

In four cylinder explosive motors, known a kind of explosive motor, in this explosive motor, the relief opening of cylinder converges in cylinder head each other, and in cylinder block, be fed to cooling water in the cylinder head be guided near the fluidic junction that is formed at the relief opening the cylinder head, pass independent coolant outlet and be discharged to outside (seeing Japan Patent No.2709815).In this explosive motor, therefore the fluidic junction of relief opening that becomes high temperature in cylinder head can prevent that the fluidic junction of relief opening is overheated by water quench.

But, in the time will being fed to radiator, becoming streamlined in order to make cooling water pipeline from cylinder head to radiator from the cooling water that cylinder head is discharged, the coolant outlet with cylinder head is combined into one usually.But, when the even fluidic junction of chill vent and when cooling water is directed to independent coolant outlet on the whole, it is very complicated that the structure of the cooling water passage in the cylinder head can become, thereby, not only the flow passage resistance force of waterproof of cooling water can increase, and the problem of a large amount of steps of needs and cost for the production cylinder head can occur.

Summary of the invention

The object of the present invention is to provide a kind of cooling water passage structure that can make the interior cooling water passage of cylinder head become fairshaped cylinder head.

According to the present invention, a kind of cooling water passage structure of cylinder head is provided, described cylinder head is arranged at cylinder in the explosive motor that vertically relief opening of layout and at least one pair of cylinder converges in cylinder head each other successively of cylinder head, wherein, cylinder head vertically on an end be provided with the cooling water flow inlet that leads to cylinder head inside, cylinder head vertically on the other end be provided with the outflow opening of main cooling water stream of the central part of the cylinder head of flowing through, and be provided with from the main cooling water flow point and pitch out and the outflow opening of the secondary cooling water flow that around the fluidic junction of the relief opening that is positioned at cylinder head side portion, flows, and, be communicated with and the adapter that these outflow openings are combined into a coolant outlet be fixed to the outer wall surface of the described the other end of cylinder head with the outflow opening of the outflow opening of main cooling water stream and secondary cooling water flow.

That is,, then can increase the cost of production of some, so do not use adapter usually if use such adapter.But, if use such adapter, then can make the cooling water runner in the cylinder head become streamlined, so, compare above-mentioned known explosive motor and have sizable advantage.

Description of drawings

Fig. 1 is the plan cross-sectional view of cylinder head;

Fig. 2 is the sectional view of the cylinder head seen along the II-II line of Fig. 1;

Fig. 3 is the sectional view of the cylinder head seen along the III-III line of Fig. 1;

Fig. 4 is the view that the contour shape of core and cooling water passage is shown.

Embodiment

Fig. 1 and Fig. 2 illustrate by for example aluminum alloy cast-in-block cylinder head 1.Notice that in Fig. 1, circle shown by dashed lines is represented the position of No. 1 cylinder #1, No. 2 cylinder #2, No. 3 cylinder #3 and No. 4 cylinder #4, the explosive motor that therefore is provided with cylinder head shown in Figure 11 as can be known is the in-line arrangement four-cylinder explosive motor.In Fig. 1,2 expressions are by the IO Intake Valve Opens and the valve port of closing, and 3 expressions are by the exhauxt valve opens and the valve port of closing.Therefore each cylinder #1, #2, #3 and #4 are respectively arranged with a pair of intake valve and a pair of exhaust valve as can be known.

Cylinder head 1 is formed with the suction port 4 corresponding to cylinder #1, #2, #3 and #4.In addition, cylinder head 1 relief opening 8 that is formed with the relief opening 5 that is used for No. 1 cylinder #1, the relief opening 6 that is used for No. 2 cylinder #2, the relief opening 7 that is used for No. 3 cylinder #3 and is used for No. 4 cylinder #4.From Fig. 1, be appreciated that

relief opening

5,6,7 and 8 corresponding each separate near to valve port 3, still when separating, just become a relief opening with valve port 3.

Now, from Fig. 1, be appreciated that the relief opening of a pair of cylinder in the middle of being positioned at---promptly, the relief opening 6 of No. 2 cylinder #2 and the relief opening 7 of No. 3 cylinder #3---in cylinder head 1, converge each other to form a merged exhaust port 9.This merged exhaust port 9 extends to the sidewall surfaces 10 of cylinder head 1.In Fig. 1, if will extend through central authorities between No. 2 cylinder #2 and No. 3 cylinder #3 and the plane vertical with the plane of the cylinder-bore axis that comprises cylinder #1, #2, #3 and #4 is called " symmetry plane K-K " along the cylinder-bore axis direction, then the relief opening 7 of the relief opening 6 of No. 2 cylinder #2 and No. 3 cylinder #3 is about this symmetry plane K-K symmetric arrangement.Merged exhaust port 9 extends to the sidewall surfaces 10 of cylinder head 1 along symmetry plane K-K.

On the other hand, be positioned at the relief opening of a pair of cylinder at two ends---promptly, the relief opening 5 of No. 1 cylinder #1 and the relief opening 8 of No. 4 cylinder #4---also about symmetry plane K-K symmetric arrangement.In this case, the relief opening 5 of No. 1 cylinder #1 extends towards merged exhaust port 9 from No. 1 cylinder #1, then, the state that relief opening 5 and merged exhaust port 9 is separated with the thin-walled 11 of the merged exhaust port 9 one sides sidewall surfaces 10 of extending until cylinder head 1 along merged exhaust port 9; Simultaneously, the relief opening 8 of No. 4 cylinder #4 extends towards merged exhaust port 9 from No. 4 cylinder #4, then, the state that relief opening 8 and merged exhaust port 9 is separated with the thin-walled 12 of the merged exhaust port 9 one sides sidewall surfaces 10 of extending until cylinder head 1 along merged exhaust port 9.

As shown in Figure 2, cylinder head 1 within it portion be formed with cooling water passage 13.Fig. 4 (A) illustrates the plan view that is used for forming the core 14 of cooling water passage 13 when casting cylinder cover 1, and Fig. 4 (B) illustrates the contour shape of this core 14 of use at the cylinder head 1 inner cooling water passage 13 that forms.

Shown in Fig. 4 (A), core 14 vertically on two ends be formed with the

core support

15,16 that is used for when casting cylinder cover 1, supporting core 14.That is, in Fig. 4 (A), dot and dash line a, b are illustrated in the position of the inside of backform and bed die.Therefore, the hatched area of the

core support

15,16 among Fig. 4 (A) is clamped between backform and the bed die.

On the other hand, on core 14, extend in cooling water passage district 17, to be used to cool off the fluidic junction Z (Fig. 1) at the relief opening of the side of the longitudinal axis J that passes

core support

15,16 of core 14.Side in core support 15 is formed with core 18, and this core 18 is basically parallel to the cross sectional area of core support 15 extensions and core 18 less than core support 15 from cooling water passage district 17.This core 18 also is clamped between backform and the bed die at the hatched area place when casting cylinder cover 1.

With reference to figure 4 (B), cylinder head 1 vertically on an end be provided with the cooling water flow inlet 19 that leads to cylinder head 1 inside.Cooling water in the cylinder block flow in the cylinder head 1 from this cooling water flow inlet 19.On the other hand, cylinder head 1 vertically on the other end be provided with the main cooling water that forms by core support 15 and export 20 and the secondary coolant outlet 21 that forms by core 18.

Shown in Fig. 1, Fig. 3 and Fig. 4 (B), with main cooling water outlet 20 with secondary coolant outlet 21 is communicated with and the adapter 23 that these

outflow openings

20,21 are combined into a coolant outlet 22 is fixed to the outer wall surface of cylinder head 1.The coolant outlet 22 of this adapter 23 is connected to radiator.

Shown in the arrow X among Fig. 4 (B), main cooling water from cooling water flow inlet 19 flow through cylinder head 1 central part and flow to main cooling water outlet 20.Because this main cooling water stream X, cylinder #1 to #4 is able to even cooling.On the other hand, at the cylinder head 1 inner secondary cooling water flow Y that forms the cooling water passage district 17 at the fluidic junction Z place of from main cooling water stream X, telling and flow to relief opening.Secondary cooling water flow Y flows to secondary coolant outlet 21 in 17 inside, cooling water passage district.The fluidic junction Z of relief opening is cooled off by secondary cooling water flow Y, therefore, can prevent that the fluidic junction Z of relief opening is overheated.

Shown in Fig. 4 (B), main cooling water stream X flows straight above cylinder #1 to #4 is so cooled off cylinder #1 to #4 equably when keeping low flow resistance.On the other hand, can be simultaneously from then on main cooling water stream X bifurcated go out a little secondary cooling water flow Y, so the fluidic junction Z integral body of relief opening is evenly cooled off by secondary cooling water flow Y.

In the present invention, in order to simplify the cooling water passage structure of cylinder head 1 inside, with main cooling water outlet 20 and the separately independent formation of secondary coolant outlet 21.Use adapter 23 that these

outflow openings

20,21 are combined into a coolant outlet 22.There is optimum value in the amount of main cooling water stream X with ratio between the amount that flows the secondary cooling water flow Y that the X bifurcated goes out from main cooling water.This ratio is regulated by the limited member 24 of unlatching that is arranged in the main cooling water outlet 20 as shown in Fig. 1 and Fig. 4 (B).Note, must use adapter 23 attached these that are attached on the cylinder head 1 with removably to open limited member 24.

Notice that if the wall portion that air accumulation in the cooling water passage of cylinder head 1, then contacts with air will can not be cooled, so cooling effectiveness will descend.Therefore, be necessary to prevent that air accumulation is in the cooling water passage of cylinder head 1.Therefore, in according to the embodiment of the present invention, with secondary coolant outlet 21 between main cooling water outlet 20 and coolant outlet 22, so that discharge the air in the cylinder head 1, as shown in Figure 3, secondary coolant outlet 21 is arranged in the positions higher than main cooling water outlet 20, and coolant outlet 22 is arranged in the position higher than secondary coolant outlet 21.

Claims

1. A cooling water channel structure of a cylinder head, the cylinder head is provided in an internal combustion engine where cylinders are arranged in sequence along the longitudinal direction of the cylinder head and exhaust ports of at least one pair of the cylinders meet each other in the cylinder head in the engine, where

One end of the cylinder head in the longitudinal direction is provided with a cooling water inlet leading to the inside of the cylinder head, and the other end of the cylinder head in the longitudinal direction is provided with a main cooling water flow flowing through the central part of the cylinder head. outlet, and is provided with an outflow port of a sub-cooling water flow branched from the main cooling water flow and flowing around the confluence of the exhaust port located on the side of the cylinder head, and, with the main cooling water flow An adapter that communicates the outflow port with the outflow port of the secondary cooling water flow and combines these outflow ports into one cooling water outlet is fixed to the outer wall surface of the other end of the cylinder head.

2. The cooling water channel structure of the cylinder head according to claim 1, wherein the outflow port of the secondary cooling water flow is located between the outflow port of the main cooling water flow and the cooling water outlet, and the secondary cooling water flow The outlet of the cooling water flow is arranged at a higher position than the outlet of the main cooling water flow.

3. The cooling water channel structure of the cylinder head according to claim 1, wherein an opening restriction member is inserted into the outflow port of the main cooling water flow.